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This paper proposes a new class of heteroskedastic and autocorrelation consistent (HAC) covariance matrix estimators. The standard HAC estimation method reweights estimators of the autocovariances. Here we initially smooth the data observations themselves using kernel functionâ€“based weights. The resultant HAC covariance matrix estimator is the normalized outer product of the smoothed random vectors and is therefore automatically positive semidefinite. A corresponding efficient GMM criterion may also be defined as a quadratic form in the smoothed moment indicators whose normalized minimand provides a test statistic for the overidentifying moment conditions

Topics:
HB, QA

Publisher: Cambridge University Press

Year: 2005

OAI identifier:
oai:wrap.warwick.ac.uk:733

Provided by:
Warwick Research Archives Portal Repository

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- (1991). Heteroskedasticity and autocorrelation consistent covariance matrix estimation+
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